Substituted benzoxazinone cyclohexanediones and their herbicidal uses

ABSTRACT

The present disclosure is directed to substituted cyclohexanedione compounds, the preparation of said compounds, compositions containing said compounds and the use of said compositions in the selective pre- and postemergent kill and control of grassy weeds in the presence of various broad-leafed and grassy crop plants.

FIELD OF THE INVENTION

The present invention is directed to substituted benzoxazinone cyclohexanedione compounds, compositions containing said compounds and the use of said compositions in the selective pre- and postemergent kill and control of grassy weeds growing in broadleaf and some grassy crops.

SUMMARY OF THE INVENTION

The present invention is directed to cyclohexanedione compounds corresponding to the formula ##STR1## Wherein in this and in subsequent formula depictions, D is attached in the 6 or 7 ring position and represents the radical ##STR2## R represents --H, or acyl; R¹ represents C₁ -C₃ alkyl, C₃ -C₅ alkenyl or C₃ -C₅ haloalkenyl, arylalkenyl wherein aryl represents phenyl or pyridinyl substituted with from 0 to 4 halo or --CF₃ groups or mixtures thereof and alkenyl contains from C₃ -C₅ carbon atoms;

R² represents C₁ -C₃ alkyl;

R³ represents --H or --CH₃ ;

R⁴ each independently represents --H, halo, C₁ -C₄ alkyl or C₁ -C₄ alkoxy;

R⁵ represents --H, C₁ -C₄ alkyl, C₁ -C₄ haloalkyl, C₃ -C₅ alkenyl, C₃ -C₅ haloalkenyl, C₃ -C₅ alkynyl, C₃ -C₅ haloalkynyl, alkoxyalkyl wherein the alkoxy and alkyl group each contains from C₁ -C₄ carbon atoms or alkylthioalkyl wherein each alkyl group thereof contains from C₁ -C₄ carbon atoms;

R⁶ represents R⁵, C₁ -C₄ alkoxy or aryl wherein aryl is phenyl or pyridinyl substituted with from 0-3 halogen or methyl groups.

R⁷ represents --H or C₁ -C₄ alkyl; and

n represents the integer 1, 2 or 3;

and the herbicidally acceptable organic and inorganic salts thereof.

In addition, the present invention is directed to compositions containing the compounds of Formula I, as an active ingredient therein, and to methods of using said compositions in the selective pre- and postemergent kill and control of grassy weeds, especially in the presence of crop plants such as those hereinafter set forth. The present invention is also directed to a method of preparing the compounds of Formula I.

In the present specification and claims, the herbicidally acceptable organic and inorganic salts of Formula I, which are useful in the selective pre- and postemergent kill and control of grassy weeds, are those conventionally employed and include the alkali metal salts of the metals sodium, potassium, rubidium, lithium, cesium and the like; alkaline earth metal salts of the metals calcium, strontium, magnesium, barium and the like; salts of the metals manganese, copper and iron; and ammonium and phosphonium salts such as the mono-, di-, tri- and tetraalkylammonium salts; triphenylphosphonium salts and the like.

In the present specification and claims, the term "halo", as used alone or as a substituent, designates the halogens bromo, chloro, fluoro and iodo.

In the present specification and claims, the term "alkyl" designates alkyl groups having carbon chain lengths of 1 to 3 or 1 to 4 carbon atoms and may be straight or branched chain as appropriate within the chain length such as, for example, methyl, ethyl, n-propyl, i-propyl, n-butyl, i-butyl, sec.-butyl or t-butyl.

In the present specification and claims, the term "C₁ -C₄ alkoxy" designates straight or branched chain alkoxy groups of 1 to 4 carbon atoms such as, for example, methoxy, ethoxy, n-propoxy, i-propoxy, n-butoxy, i-butoxy, sec-butoxy or t-butoxy.

In the present specification and claims, the term "C₁ -C₄ haloalkyl" designates straight or branched chain alkyl groups of 1 to 4 carbon atoms substituted with from 1 halo atom up to perhalo substitution.

In the present specification and claims, the terms "C₃ -C₅ alkenyl" designates straight or branched chain alkenyl groups of 3 to 5 carbon atoms, such as, for example, allyl, 2-butenyl, 3-butenyl, methallyl or pentenyl.

In the present specification and claims, the term "C₃ -C₅ haloalkenyl" designates straight or branched chain alkenyl groups of 3 to 5 carbon atoms, substituted with from 1 halo atom up to perhalo substitution, such as, for example, 3-chloro-2-propenyl, 3,3,2-trifluoropropenyl and the like.

In the present specification and claims, the term "C₃ -C₅ alkynyl" designates straight or branched chain alkynyl groups of 3 to 5 carbon atoms including, for example, propargyl, 2-butynyl or 3-butynyl.

In the present specification and claims, the term "C₃ -C₅ haloalkynyl" designates straight or branched chain alkynyl groups of 3 to 5 carbon atoms substituted with from 1 halo atom up to perhalo substitution.

In the present specification and claims, the term "acyl" designates radicals of the formula R⁸ --C(O)-- wherein R⁸ represents C₁ -C₄ alkyl, C₁ -C₄ haloalkyl or phenyl.

The active ingredients of Formula I wherein R represents hydrogen constitutes a preferred embodiment. The active ingredients of Formula I wherein R¹ and R² each represent alkyl constitute a more preferred embodiment.

In the present invention, it is to be noted that all substituent groups are sterically compatible with each other. The term "sterically compatible" is employed to designate substituent groups which are not affected by steric hindrance as this term is defined in "The Condensed Chemical Dictionary", 7th edition, Reinhold Publishing Co., N.Y. page 893 (1966) which definition is as follows:

"steric hindrance. A characteristic of molecular structure in which the molecules have a spatial arrangement of their atoms such that a given reaction with another molecule is prevented or retarded in rate."

Sterically compatible may be further defined as reacting compounds having substituents whose physical bulk does not require confinement within volumes insufficient for the exercise of their normal behavior as discussed in Organic Chemistry by D. J. Cram and G. Hammond, 2nd edition, McGraw-Hill Book Company, N.Y., page 215 (1964).

The cyclohexanediones of the present invention which correspond to Formula I, may exist in either form or in admixtures of the isomeric forms representing D as set forth below in Formulae Ia and Ib: ##STR3##

The cyclohexanediones of the present invention, when R is hydrogen, can exist in any of the four tautomeric forms set forth hereinbelow: ##STR4##

The compounds of the present invention are generally low melting crystalline solids at ambient temperatures which are soluble in many organic solvents.

Representative compounds which correspond to Formula I (Compounds of Formulae II and III) include the compounds set forth below in Tables I and II.

                                      TABLE I                                      __________________________________________________________________________      ##STR5##                                               II                     R      R.sup.1    R.sup.2                                                                            R.sup.3                                                                            (R.sup.4).sub.n                                                                     R.sup.5     R.sup.6  R.sup.7                    __________________________________________________________________________     H      Et         Et  H   H    H           H        H                          H      Et                                                                      n-Pr   H          H   H   Me   H                                               H      Et         Et  H   H    H           Me       Me                         H      Et                                                                      n-Pr   H          H   Me  Me   Me                                              H      CH.sub.2 CHCH.sub.2                                                                       Et  H   7-Cl H           H        H                          H      Et         Et  Me  H    H           H        H                          H      Et         Et  H   H    CH.sub.2 CHCH.sub.2                                                                        Me       H                          H      CH.sub.2 CHCHCl                                                         n-Pr   H          H   H   Me   Me                                              H      Et         Et  H   H    H           CH.sub.2 OEt                                                                            H                          H      Et         Et  H   H    H           R.sup.6 + R.sup.7                                                                       C(CH.sub.3).sub.2          H      CH.sub.2 CHCH.sub.2                                                                       Et  H   H    H           Ph       H                          H      Et         Et  Me  H    Me          Me       H                          H      Et         Et  H   8-Cl H           Me       Me                         H      Et         Et  H   H    CH.sub.2 CCH                                                                               H        H                          H      Et         Et  H   H    H           CH(CH.sub.3).sub.2                                                                      H                          H      Et         Et  H   H    H           Et       Me                         C(O)CH.sub.3                                                                          Et         Et  H   H    H           Me       H                          H      Et                                                                      n-Pr   H          7-CH.sub.3                                                                         H   H    H                                               H      Et                                                                      n-Pr   H          7-CH.sub.3                                                                         H   Me   H                                               H      Et         Et  H   H    H                                               n-Pr   H                                                                       H      Et         Et  H   H    H                                               n-Pr   Me                                                                      H      Et         Et  H   H    CH.sub.2 OMe                                                                               H        H                          H      Et         Et  H   H    CH.sub.2 CH.sub.2 Cl                                                                       Me       H                          H      Et                                                                      n-Pr   H          H   CH(CH.sub.3).sub.2                                                                 H    H                                               H      Et                                                                      n-Pr   Me         H   Me  H    H                                               H      CH.sub.2 CHCH.sub.2                                                                       Et  H   5,7-diMe                                                                            H           H        H                          H      CH.sub.2 CH CHPh                                                                          Et  H   H    H           Me       H                          H      Et         Et  H   H    H           Ph       Me                         Na     Et         Et  H   H    H           Me       Me                         H      Et         Et  H   H    CH.sub.2 Ph H        H                          H      Et         Et  H   H    (CH.sub.2).sub.3 Cl                                                                        H        H                          H      Et         Et  H   8-F  H           Me       Me                         H      Et         Et  H   5-F  H           Me       Me                         H      Et                                                                      n-Pr   H          H   Et  Me   H                                               H      Et         Et  H   H                                                    n-Pr   H          H                                                            i-Pr   Et         Me  H   H    CH.sub.2 CHCH.sub.2                                                                        H                                   H      Et         Et  Me  H    CH.sub.2 CH.sub.2 SEt                                                                      CF.sub.3 H                          H      Et         Et  H   H    CH.sub.2 O-t-Bu                                                                            CH.sub. 2 CHCH.sub.2                n-Pr                                                                           H      Et         Me  H   H    CH.sub.2 CHCHCF.sub.3                                                                      F        H                          H      Et         Me  Me  H    CH(Cl)CCH   H                                   i-Pr                                                                           H      Et                                                                      i-Pr   H          5-OCH.sub.3                                                                        CH.sub.2 CHCH.sub.2                                                                2-(3-F,5-                                                                           H                                                                                          CF.sub.3)Py                         K      CH.sub.2 CHCH                                                           i-Pr   H          H   H   H    H                                                      (2-Cl,5-CF.sub.3 Ph)                                                    __________________________________________________________________________

                                      TABLE II                                     __________________________________________________________________________      ##STR6##                                               III                    R      R.sup.1    R.sup.2                                                                            R.sup.3                                                                            (R.sup.4).sub.n                                                                     R.sup.5     R.sup.6  R.sup.7                    __________________________________________________________________________     H      Et         Et  H   H    H           H        H                          H      Et                                                                      n-Pr   H          H   H   Me   H                                               H      Et         Et  H   H    H           Me       Me                         H      Et                                                                      n-Pr   H          H   Me  Me   Me                                              H      CH.sub.2 CHCH.sub.2                                                                       Et  H   6-Cl H           H        H                          H      Et         Et  Me  H    H           H        H                          H      Et         Et  H   H    CH.sub.2 CHCH.sub.2                                                                        Me       H                          H      CH.sub.2 CHCHCl                                                         n-Pr   H          H   H   Me   Me                                              H      Et         Et  H   H    H           CH.sub.2 OEt                                                                            H                          H      Et         Et  H   H    H           R.sup.6 + R.sup.7                                                                       C(CH.sub.3).sub.2          H      CH.sub.2 CHCH.sub.2                                                                       Et  H   H    H           Ph       H                          H      Et         Et  Me  H    Me          Me       H                          H      Et         Et  H   8-Cl H           Me       Me                         H      Et         Et  H   H    CH.sub.2 CCH                                                                               H        H                          H      Et         Et  H   H    H           CH(CH.sub.3).sub.2                                                                      H                          H      Et         Et  H   H    H           Et       Me                         C(O)CH.sub.3                                                                          Et         Et  H   H    H           Me       H                          H      Et                                                                      n-Pr   H          6-CH.sub.3                                                                         H   H    H                                               H      Et                                                                      n-Pr   H          6-CH.sub.3                                                                         H   Me   H                                               H      Et         Et  H   H    H                                               n-Pr   H                                                                       H      Et         Et  H   H    H                                               n-Pr   Me                                                                      H      Et         Et  H   H    CH.sub.2 OMe                                                                               H        H                          H      Et         Et  H   H    CH.sub.2 CH.sub.2 Cl                                                                       Me       H                          H      Et                                                                      n-Pr   H          H   CH(CH.sub.3).sub.2                                                                 H    H                                               H      Et                                                                      n-Pr   Me         H   Me  H    H                                               H      CH.sub.2 CHCH.sub.2                                                                       Et  H   6,8-diMe                                                                            H           H        H                          H      CH.sub.2 CH CHPh                                                                          Et  H   H    H           Me       H                          H      Et         Et  H   H    H           Ph       Me                         Na     Et         Et  H   H    H           Me       Me                         H      Et         Et  H   H    CH.sub.2 Ph H        H                          H      Et         Et  H   H    (CH.sub.2).sub.3 Cl                                                                        H        H                          H      Et         Et  H   8-F  H           Me       Me                         H      Et         Et  H   5-F  H           Me       Me                         H      Et                                                                      n-Pr   H          H   Et  Me   H                                               H      Et         Et  H   H                                                    n-Pr   H          H                                                            i-Pr   Et         Me  H   H    CH.sub.2 CHCH.sub.2                                                                        H                                   H      Et         Et  Me  H    CH.sub.2 CH.sub.2 SEt                                                                      CF.sub.3 H                          H      Et         Et  H   H    CH.sub.2 O-t-Bu                                                                            CH.sub. 2 CHCH.sub.2                n-Pr                                                                           H      Et         Me  H   H    CH.sub.2 CHCHCF.sub.3                                                                      F        H                          H      Et         Me  Me  H    CH(Cl)CCH   H                                   i-Pr                                                                           H      Et                                                                      i-Pr   H          5-OCH.sub.3                                                                        CH.sub.2 CHCH.sub.2                                                                2-(3-F,5-                                                                           H                                                                                          CF.sub.3)Py                         K      CH.sub.2 CHCH                                                           i-Pr   H          H   H   H    H                                                      (2-Cl,5-CF.sub.3 Ph)                                                    __________________________________________________________________________

The following examples illustrate the present invention and the manner by which it can be practiced but, as such, should not be construed as limitations upon the overall scope of the same.

In the preparation of the compounds of the present invention, the amounts of the reactants to be employed are not critical. In most cases it is preferred to employ substantially equimolar amounts of the reactants. Depending upon the specific type of reaction taking place, it may be beneficial that a given one of the reactants be present in a slight excess to obtain the highest yields of the desired product.

Since the hereinabove and hereinafter set forth compound preparation procedures employ only standard chemistry practices and it is known that slightly different reactants can require slightly different reaction parameters, it is to be understood that minor modifications to the reaction parameters set forth such as the use of an equivalent solvent, the use of an excess of one of the reactants, the use of a catalyst, the use of higher or lower temperatures and/or pressure equipment, high speed mixing and other such conventional changes are within the scope of this invention.

The desired product can be separated from the reaction product of the above preparative procedures employing conventional separatory procedures known to those skilled in the art including steps such as, for example, solvent extraction, filtration, water washing, column chromatography, neutralization, acidification, crystallization and distillation.

The compounds corresponding to Formula I of the present invention, wherein R and R⁵ are both hydrogen, can be prepared by the reaction of an appropriate ketone reactant, corresponding to Formula IV: ##STR7## wherein R², R³, R⁴, R⁶, R⁷, and n are hereinbefore defined and D¹ represents the radical ##STR8## with an excess of an appropriate alkoxyamine reactant corresponding to the formula R¹ ONH₂ (wherein R¹ is as hereinbefore defined)or an inorganic salt thereof and from about 1-2 moles of a base. This reaction can be conducted at temperatures of from about 0° to about 100° C. in the presence of a solvent.

Representative solvents include, for example, dimethyl sulfoxide, C₁ -C₄ alkanols, hydrocarbons, cyclic ethers, halohydrocarbons, and the like, with the C₁ -C₄ alkanols being preferred.

Representative bases include, for example, the carbonates, acetates, alcoholates and hydroxides of the alkali and alkaline earth metals, in particular, sodium and potassium, and organic bases, such as pyridine or tertiary amines, with anhydrous sodium acetate being preferred.

The reaction time can extend for a time of from a few minutes up to 24 hours or more, depending upon the specific reactants and reaction temperature. The product can be recovered employing one or more of the conventional separatory techniques set forth hereinabove.

The herbicidally acceptable organic and inorganic salts of the compounds of Formula I can be prepared from said compounds of Formula I employing conventional procedures. The salts are conveniently obtained by mixing an appropriate organic or inorganic base with a compound of Formula I where R is hydrogen, if necessary, in an inert solvent; distilling off the solvent and recrystallizing the residue as necessary.

Representative solvents include, for example, water, C₁ -C₄ alkanols, hydrocarbons, cyclic ethers, halohydrocarbons, and the like, with the C₁ -C₄ alkanols being preferred.

Representative bases include, for example, the carbonates, alcoholates and hydroxides of the alkali and alkaline earth metals, in particular, sodium and potassium, and organic bases, such as pyridine or tertiary amines. For ease of formulation, these salts are prepared by neutralization of the above compound of Formula I in an equimolar amount of the base. Other metal salts such as, for example, the manganese, copper, zinc and iron salts can be prepared from the alkali metal salts employing conventional salt forming procedures for these metals. In addition, the ammonium and phosphonium salts can be prepared employing conventional ammonium and phosphonium salt forming procedures.

The compounds corresponding to Formula I, wherein R is acyl can be prepared by reacting a compound of Formula I, wherein R is hydrogen with a compound of the formula acyl-L wherein L is a leaving group such as, for example, chloride, bromide, iodide, nitrate, sulfate, methyl sulfate, ethyl sulfate, tetrafluoroborate, hexafluorophosphate, methanesulfonate, fluorosulfonate and trifluoromethanesulfonate. This reaction can be carried out employing the appropriate conventional reaction procedures such as taught in U.S. Pat. Nos. 4,631,081 and 4,680,400.

The compounds corresponding to Formula IV wherein R⁵ is other than hydrogen and which corresponds to Formula IVb ##STR9## can be prepared by the reaction of a compound which corresponds to Formula IVa ##STR10## with a compound of the formula R^(5*) -X wherein R^(5*) represents R⁵ less hydrogen and X is a leaving group such as, for example, chloride, bromide, iodide or sulfonate. The reaction is conducted in the presence of from about 1 to about 3 equivalents of a suitable base such as, for example, sodium hydride or potassium carbonate and a polar solvent such as, for example, dimethyl formamide or methyl sulfoxide. The reaction is usually carried out at a temperature of from about 0° to about 140° C. for reaction times of from about 0.5 to about 24 hours, depending on the specific R^(5*) -X reactant.

The compounds corresponding to Formula IVa wherein R⁵ and R⁷ are both hydrogen can be prepared by the reaction of an appropriate reactant corresponding to Formula V ##STR11## with from about 2 to about 4 equivalents of a suitable base such as, for example, sodium bicarbonate in water at a temperature of from about 20° to about 100° C. or with from about 2 to about 4 equivalents of a sodium ethoxide (prepared by dissolving sodium metal in absolute ethanol) at a temperature of from about 20° C. to the reflux temperature. The reaction is usually carried out in the presence of a suitable solvent such as, for example, water, lower alkanol, dimethyl formamide or methyl sulfoxide. The reaction mixture is diluted with water, acidified to a pH of about 2-4 with 1N HCl and the product recovered by conventional techniques such as filtration or extraction.

The compounds corresponding to Formula IVa wherein R⁶ is alkoxymethyl can also be prepared by the reaction of an appropriate reactant corresponding to Formula Va ##STR12## with excess sodium alkoxide(prepared by dissolving sodium metal in the alkanol corresponding to the desired alkoxy group of R⁶) at a temperature of from about 20° C. up to the reflux temperature for a period of from 0.5 to 4.0 hours. The reaction is carried out in the presence of the same alcohol solvent used to prepare the alkoxide. The reaction mixture is diluted with water, acidified to a pH of about 2-4 with 1N HCl and the product recovered by conventional techniques such as filtration or extraction.

The compounds corresponding to Formula Va can be prepared by the treatment of a compound corresponding to Formula VI ##STR13## with from about 1 to about 10 equivalents of a base such as, for example, triethylamine or pyridine in a solvent such as, for example, acetonitrile or tetrahydrofuran at temperatures of from 20° C. up to the reflux temperature for a period of from 0.5 to 24.0 hours. The product is recovered by conventional techniques such as filtration or extraction.

The compounds corresponding to Formula V can be prepared by the treatment of a compound corresponding to Formula VII ##STR14## with a compound of the formula

    Y--C(O)--CH(X)--R.sup.6

wherein X and R⁶ are as defined hereinabove and Y is a leaving group such as, for example, chloride, bromide or --O--C(═O)--R. The reaction is generally carried out at temperatures of from 0° to about 40° C. in the presence of from about 2 to about 4 equivalents of anhydrous sodium acetate, or other suitable base, such as pyridine, in a solvent such as tetrahydrofuran for a period of from about 1 to about 12 hours. The reaction mixture is diluted with water, acidified to a pH of about 2-4 with 1N HCl and the product recovered by conventional techniques such as filtration or extraction.

The compounds corresponding to Formula VI can be prepared by the treatment of a compound corresponding to Formula VII with a compound of the formula

    Cl--C(O)--CH(Cl)--CH.sub.2 --Cl

The reaction is generally carried out at temperatures of from 0° to about 40° C. in the presence of from about 2 to about 4 equivalents of anhydrous sodium acetate in a solvent such as tetrahydrofuran for a period of from about 1 to about 12 hours. The reaction mixture is diluted with water, acidified to a pH of about 2-4 with 1N HCl and the product recovered by conventional techniques such as filtration or extraction.

In another procedure of converting the compounds of Formula VII to the compounds of Formula V and the subsequent conversion of the compounds of Formula V to the Compounds of Formula IVb can be accomplished in a single operation following the method reported by Shridhar in Org Prep Proceed Int'l, 1982, 14(3), page 195; with the modification of adding an additional equivalent of sodium bicarbonate.

The compounds of Formula VII are usually not isolated, but are normally employed as a concentrated solution in an inert organic solvent after preparation from compounds of Formula VIII ##STR15## The reaction can be accomplished by hydrogenation under a 10 to 50 lbs pressurized hydrogen atmosphere in the presence of a catalyst such as platinum or palladium, with a sulfided 5 percent platinum on carbon being preferred, and in the presence of an aprotic solvent such as ethyl acetate, tetrahydrofuran or dioxane with ethyl acetate being preferred. The reaction requires from about 1 to about 6 hours at temperatures of from about 15° to about 30° C. When the reaction is complete, the excess hydrogen is removed by sparging with nitrogen gas, the catalyst is then removed by filtration through an absorbent such as diatomaceous earth, silica gel and the like and the filtrate solution is evaporated under reduced pressure until the desired compound of Formula VII is in a concentration of around 50 percent in the remaining solvent. The viscous oily product which remains is then employed directly in the next reaction as described hereinabove.

The compounds corresponding to Formula VII can also be prepared in a two step procedure wherein an appropriate reactant corresponding to Formula VIII dissolved in ethyl acetate is treated in a pressurizable reactor with a platinum or palladium on carbon catalyst and agitated while pressurizing the reactor with hydrogen for a period of from one to 24 hours. The mixture is then sparged with nitrogen gas to remove residual hydrogen and filtered through an absorbent such as diatomaceous earth, silica gel and the like. The solvent is removed by evaporation and the residue dissolved in tetrahydrofuran or dioxane. The solution is cooled to a temperature of from about 0° to about 10° C. and treated with anhydrous sodium acetate and then with chloroacetyl chloride. The mixture is allowed to come to room temperature and diluted with cold dilute HCl. The product can be recovered by filtration or other conventional solid-liquid separatory procedures.

The compounds corresponding to Formula VIII ##STR16## can be prepared by nitration with 1 to 2 equivalents of concentrated nitric acid (90 percent nitric acid) of a compound corresponding to Formula IX ##STR17## in a solvent such as dichloromethane, 1,2-dichloroethane or acetic anhydride at a temperature of from about 0° to about 5° C. After about 0.5 to about 2.0 hours, the reaction mixture is partitioned between water and dichloromethane. The product is contained in the organic layer and is recovered by conventional separatory procedures such as drying and evaporation. The product can be further purified, if desired, by conventional recrystallization techniques.

The compounds corresponding to Formula VIIIa ##STR18## and their preparation is taught in U.S. Pat. No. 4,692,553.

The compounds corresponding to Formula X and their preparation is taught in U.S. Pat. No. 4,983,211.

The compounds corresponding to Formula IV can also be prepared in a two step procedure wherein an appropriate reactant corresponding to Formula X ##STR19## wherein R², R³, R⁴, R⁵, R⁶, R⁷, and n are hereinbefore defined is first reacted with 2 to 4 equivalents of a 1 to 2N concentration of an alkaline base, preferably 1N sodium hydroxide in water at a temperature of between about 40° and about 100° C. for a period of from about 2 to about 48 hours. The reaction mixture is then cooled to between about 20° and about 40° C. and acidified with excess ( 4 to 10 equivalents ) of 1N to concentrated hydrochloric acid to obtain an acidic aqueous solution or a suspension of an intermediate compound of the formula ##STR20## which often spontaneously decarboxylates to the desired product of Formula IV upon standing for from 1 to about 72 hours. Alternatively, the compound of Formula XI can be isolated by conventional techniques such as filtration or extraction and then heated at a temperature of from about 80° to about 140° C. in the presence of a solvent such as methyl sulfoxide or sulfolane for a period of from about 0.2 to about 0.5 hours to effect conversion of the compound to the compound of Formula IV. The product can be recovered by diluting the reaction mixture with water and removing the product therefrom by conventional techniques such as filtration or extraction.

The compounds corresponding to Formula XI can be prepared by heating a compound corresponding to Formula XII ##STR21## in a solvent such as, for example, chloroform or benzene that contains from 1-2 equivalents of an appropriate alkanoic anhydride and 1-2 equivalents of a base such as, for example, 4-dimethylaminopyridine or imidazole, at a temperature of from about 40° C. up to the reflux temperature of the mixture. After a heating period of from about 4 to about 24 hours, the reaction mixture is cooled to room temperature, washed with 1N HCl and then with a saturated NaCl solution, dried and the solvent removed under reduced pressure. The product is then purified using conventional techniques such as filtration or extraction. The compounds of Formula XI normally exist as mixtures of diastereomers in variable relative composition.

The compounds corresponding to Formula XII can be prepared by the reaction of an appropriate reactant corresponding to Formula XIII ##STR22## wherein R⁴, R⁵, R⁶, R⁷, and n are hereinbefore defined, in an alkanol solvent with a solution prepared by mixing equimolar amounts of a solution of diethyl malonate (or mono alkyl substituted derivative thereof) in a C₁ -C₄ alkanol and a fresh solution of sodium metal dissolved in a C₁ -C₄ alkanol. The mixture is stirred at a temperature of from about 20° C. up to the reflux temperature of the mixture for a period of about 2 to about 24 hours. The reaction mixture is cooled to room temperature, diluted with water, acidified to a pH of about 2-4 with 1N hydrochloric acid and the product is recovered by conventional techniques such as filtration or extraction. The compounds of Formula XII normally exist as mixtures of diastereomers in variable relative composition.

The compounds corresponding to Formula XIII can be prepared by the reaction of an appropriate reactant corresponding to Formula XIV ##STR23## wherein R⁴, R⁵, R⁶, R⁷ and n are hereinbefore defined with acetone in water and from about 0.1 to about 2 equivalents of a base such as, for example, sodium hydroxide. The reaction is conducted at from about 20° C. up to the reflux temperature of the mixture for a period of about 0.5 to about 48 hours. The reaction mixture is diluted with water, acidified to a pH of about 2-4 with 1N hydrochloric acid and the product is recovered by conventional techniques such as filtration or extraction. Alternatively, the reaction can be performed with an acetone derivative such as 1-triphenylphosphoranylidene-2-propanone in an inert solvent such as benzene, toluene or chloroform.

The compounds corresponding to Formula XIV wherein the aldehyde group is attached to the 6 ring position and corresponding to Formula XIVa ##STR24## wherein R⁴, R⁵, R⁶, R⁷, and n are hereinbefore defined can be prepared by formylation of a compound of Formula XV, ##STR25## for example, by treatment of said compound with a 5 to 10 equivalent excess of α,α-dichloromethyl ether in the presence of a 2 to 3 equivalent excess of titanium (IV) chloride in a solvent such as, for example, dichloromethane or 1,2-dichloroethane at room temperature.

The compounds corresponding to Formula XV can be prepared from the appropriately substituted 2-aminophenol of Formula XVI ##STR26## according to the known methods taught by Shridhar, Org Prep Proceed Int'l, 1982, 14(3), 195 or Huang, Synthesis, 1984, page 851.

The compounds corresponding to Formula XIV wherein the aldehyde group is attached to the 7 ring position and corresponding to Formula XIVb ##STR27## wherein R⁴, R⁵, R⁶, R⁷, and n are hereinbefore defined can be prepared via an appropriate aminophenol derivative of Formula XVII ##STR28## wherein R⁴ and n are as defined hereinabove and Z represents a carboxaldehyde, a protected carboxaldehyde (for example, ethylenedioxy acetal) or a carboxaldehyde precursor (for example, carbinol). The reactant can be converted to the benzoxazine compound of Formula XVIII ##STR29## via the previously outlined procedures set forth for converting the compound of Formula XVI to the compound of Formula XV and followed by the procedures set forth for converting the compound of Formula VII through the various intermediates to the compound of Formula IVb. The thus prepared compound of Formula XVIII is then subjected to a deprotection procedure or other conventional procedures to convert the Z group to a carboxaldehyde to produce compounds corresponding to Formula XIVb.

In the compound preparation procedures set forth hereinabove where no specific substituent is set forth for the R⁵ grouping, the R⁵ substituent is assumed to be hydrogen. The hydrogen substituent can be converted to the other listed R⁵ substituents via the procedure set forth for the transformation of the compound of Formula IVa to the compound of Formula IV.

The following Examples illustrate the present invention and the manner by which it can be practiced, but as such, should not be construed as limitations upon the overall scope of the same.

EXAMPLE I 2-(1-(Ethoxyimino)propyl)-3-hydroxy-5-(3-oxo-(2H,4H)-1,4-benzoxazin-6-yl)cyclohex-2-en-1-one ##STR30##

A solution of 1.4 grams(g) (4.4 mmol) of 2-propionyl-3-hydroxy-5-(3-oxo-(2H, 4H)-1,4-benzoxazin-6-yl)cyclohex-2-en-1-one in 40 milliliters (mL) of methyl sulfoxide was mixed with 0.50 g (5.2 mmol) of ethoxyamine hydrochloride and 0.40 g (4.9 mmol) of anhydrous sodium acetate. The resulting clear amber solution was stirred at ambient temperature under a nitrogen atmosphere for 4 hours. The mixture was diluted with 300 mL of water and extracted thrice with 20 mL portions of dichloromethaneo The extracts were combined, washed with aqueous sodium chloride, dried over MgSO₄ and filtered. The solution was then eluted through a short column of silica gel and flushed with 100 mL of dichloromethane. Evaporation of the solvent gave the crude product as a yellow solid which was triturated in warm ether and filtered to afford the purified above-named product, as a light yellow solid, in a yield of 1.1 g (69 percent of theoretical). The title compound melted at 171°-172° C., with decomposition; ¹ H NMR:(3:1 CDCl₃ -DMSO-d₆) d1.09 (t, J=7 Hz,3H, --CCH₂ CH₃), 1.28 (t, J=7 Hz, 3H, --OCH₂ CH₃) 2.56-3.51 (m, 7H), 4.18(q, J=7 Hz, 2H,--OCH₂ CH₃), 4.48 (s,2H, --OCH₂ C═O), 6.85 (s, 3H, aromatic H's), 10.41 (broad s, 1H, --N--H), enol O--H not observed; (Compound 1).

    ______________________________________                                                          percent                                                       Analysis:          C        H      N                                           ______________________________________                                         Calc. for C.sub.19 H.sub.22 N.sub.2 O.sub.5.0.2 H.sub.2 O:                                        63.04    6.24   7.74                                        Found:             63.08    6.18   7.64                                        ______________________________________                                    

EXAMPLE II 2-(1-(Ethoxyimino)propyl)-3-hydroxy-5-(3-oxo-(2H,4H)-1,4-benzoxazin-7-yl)cyclohex-2-en-1-one ##STR31##

A solution of 0.9 g (2.9 mmol) of 2-propionyl-3-hydroxy-5-(3-oxo-(2H, 4H)-1,4-benzoxazin-7-yl)cyclohex-2-en-1-one in 20 mL of methyl sulfoxide was mixed with 0.30 g (3.1 mmol) of ethoxyamine hydrochloride and 0.30 g (3.7 mmol) of anhydrous sodium acetate. The resulting clear amber solution was stirred at ambient temperature under a nitrogen atmosphere for 16 hours. The mixture was diluted with 80 mL of water and the resulting solid precipitate collected by filtration. The solids were dissolved in 20 mL of dichloromethane, dried over MgSO₄ and filtered through a short column of silica gel. Evaporation off of the solvent gave the product as a white solid in a yield of 0.60 g (58 percent of theoretical). The title compound melted at 160.5°-162° C.; ¹ H NMR (CDCl₃): d1.00-1.38 (m, 6H, both --CH₂ CH₃ 's), 2.60-3.52 (m, 7H), 4.15 (q, J=7 Hz, 2H,--OCH₂ CH₃), 4.65 (s, 2H, --OCH₂ C═O), 6.80 (s, 3H, aromatic H's), 9.62 (broad s, 1H, --N--H), 14.5 (broad s, 1H, enol O--H); (Compound 2).

    ______________________________________                                                       percent                                                          Analysis:       C          H      N                                            ______________________________________                                         Calc. for C.sub.19 H.sub.22 N.sub.2 O.sub.5 :                                                  63.67      6.19   7.82                                         Found:          63.58      6.17   7.76                                         ______________________________________                                    

EXAMPLE III 2-(1-(Ethoxyimino)propyl)-3-hydroxy-5-(N-methyl-3-oxo-(2H)-1,4-benzoxazin-6-yl)-cyclohex-2-en-1-one ##STR32##

To 20 mL of methyl sulfoxide were added in sequence, 1.0 g (3.0 mmol) of 2-propionyl-3-hydroxy-5-(N-methyl-3-oxo-(2H)-1,4-benzoxazin-6-yl)cyclohex-2-en-1-one, 0.37 g (3.9 mmol) of ethoxyamine hydrochloride and 0.32 g (3.9 mmol) of anhydrous sodium acetate. The resulting mixture was stirred at ambient temperature for 5 hours, becoming a clear amber solution. The reaction mixture was diluted with 100 mL of water and extracted twice with 30 mL portions of ether. The extracts were combined, washed with water, then aqueous sodium chloride and dried over MgSO₄ and filtered. Evaporation off of the solvent gave the crude product as an oily residue which solidified upon standing. The crude solid was crushed and triturated in ether. The purified above-named product, as a tan solid, was recovered in a yield of 0.9 g (80 percent of theoretical). The title compound melted at 90°-92° C.; ¹ H NMR(CDCl₃): d1.05-1.48 (m, 6H, both --CCH₂ CH₃ 's), 2.55-3.62 (m including s at 3.31 for --N--CH₃, 1 OH) 4.18 (q, J=7 Hz, 2H,--OCH₂ CH₃), 4.60 (s, 2H, --OCH₂ C═O), 6.82-7.13 (m, 3H, aromatic H's), 15.10 (broad s, 1H, enol H); (Compound 3).

    ______________________________________                                                          percent                                                       Analysis:          C        H      N                                           ______________________________________                                         Calc. for C.sub.20 H.sub.24 N.sub.2 O.sub.5.0.2 H.sub.2 O:                                        63.88    6.54   7.45                                        Found:             63.85    6.39   7.32                                        ______________________________________                                    

EXAMPLE IV 2-(1-(Ethoxyimino)propyl)-3-hydroxy-5-(N-cyanomethyl-3-oxo-(2H)-1,4-benzoxazin-6-yl)cyclohex-2-en-1-one ##STR33##

To 15 mL of methyl sulfoxide were added in sequence, 1.2 g (3.4 mmol) of 2-propionyl-3-hydroxy-5-(N-cyanomethyl-3-oxo-(2H)-1,4-benzoxazin-6-yl)cyclohex-2-en-1-one, 0.42 g (4.4 mmol) of ethoxyamine hydrochloride an d 0.36 g (4.4 mmol) of anhydrous sodium acetate. The resulting mixture was stirred at ambient temperature for 5 and 1/2 hours, becoming a clear amber solution. The reaction mixture was diluted with 100 mL of 0.1N HCl and extracted twice with 30 mL portions of ether. The extracts were combined, washed with water, then aqueous sodium chloride, dried over MgSO₄ and filtered. Evaporation off of the solvent gave the crude product as a light amber oil which solidified upon standing. The crude solid was triturated in warm ether and the product isolated by filtration as a tan solid. The product was recovered in a yield of 1.1 g (81 percent of theoretical) and melted at 156°-159° C.; ¹ H NMR(CDCl₃): d1.05-1.41 (m, 6H, both --CCH₂ CH₃ 's), 2.57-3.62 (m, 7H), 4.17 (q, J=7 Hz, 2H,--OCH₂ CH₃), 4.70 (s, 2H, --OCH₂ C═O), 4.88 (s, 2H, --NCH₂ CN), 6.92-7.20 (m, 3H, aromatic H's), 15.10 (broad s, 1H, enol H); (Compound 4).

    ______________________________________                                                       percent                                                          Analysis:       C          H      N                                            ______________________________________                                         Calc. for C.sub.21 H.sub.23 N.sub.3 O.sub.5 :                                                  63.46      5.83   10.57                                        Found:          63.59      5.97   10.17                                        ______________________________________                                    

EXAMPLE V 2-(1-(Ethoxyimino)propyl )-3-hydroxy-5-(N-(2-propenyl)-3-oxo-(2H)-1,4-benzoxazin-6-yl)-cyclohex-2-en- 1-one ##STR34##

A solution of 1.3 g (3.7 mmol) of 2-propionyl-3-hydroxy-5-(N-(2-propenyl)-3-oxo-(2H)-1,4-benzoxazin-6-yl)cyclohex-2-en-1-one in 20 mL of methyl sulfoxide was treated with 0.43 g (4.5 mmol) of ethoxyamine hydrochloride and 0.36 g (4.4 mmol) of anhydrous sodium acetate. The resulting mixture was stirred at ambient temperature under a nitrogen atmosphere for 6 hours. The reaction mixture was diluted with 200 mL of water and extracted thrice with 20 mL portions of diethylether. The extracts were combined, washed with water, then aqueous sodium chloride, dried over MgSO₄ and filtered. Evaporation off of the solvent gave the crude product as a yellow oil which solidified upon standing. The resulting glassy solid was dissolved in a warm 1:1 ether-hexane solution. On cooling, the compound oiled out of the solution and again solidified and was isolated by filtration as a light tan solid. The product was recovered in a yield of 1.1 g (75 percent of theoretical) and melted at 79°-83° C.; ¹ H NMR(CDCl₃): d1.12 (t, J=7 Hz, 3H,--CCH₂ CH₃), 1.32 (t, J=7 Hz, 3H,--OCH₂ CH₃), 2.55-3.55 (m, 7H), 4.16 (q, J=7 Hz, 2H,--OCH₂ CH₃), 4.50-4.70 (m including s at 4.60 for OCH₂ C═O, 4H, --N--CH₂), 5.10-5.42 (m, 2H,--OCH═CH₃), 4.70 (s, 2H, --OCH₂ C═O), 4.88 (s, 2H, --NCH₂ CN), 6.92-7.20 (m, 3H, aromatic H's), 15.10 (broad s, 1H, enol H); (Compound 5).

    ______________________________________                                                       percent                                                          Analysis:       C          H      N                                            ______________________________________                                         Calc. for C.sub.22 H.sub.26 N.sub.2 O.sub.5 :                                                  66.31      6.58   7.03                                         Found:          66.57      6.68   6.82                                         ______________________________________                                    

EXAMPLE VI 2-(1-(Ethoxyimino)propyl)-3-hydroxy-5-(N-(2-chloroethyl)-3-oxo-(2H)-1,4-benzoaxazin-6-yl)cyclohex-2-en-1-one ##STR35##

To 50 mL of absolute ethanol were added in sequence 1.0 g (2.6 mmol) of 2-propionyl-3-hydroxy-5-(N-(2-chloroethyl)-3-oxo-(2H)-1,4-benzoxazin-6-6l)cyclohex-2-en-1-one, 0.33 g (3.5 mmol) of ethoxyamine hydrochloride and 0.26 g (3.2 mmol) of anhydrous sodium acetate. The resulting mixture was stirred at ambient temperature for 3 hours. The reaction mixture was diluted with 500 mL of 0.5N HCl and extracted twice with 50 mL portions of ethyl acetate. The extracts were combined, dried over MgSO₄ and filtered. Evaporation off of the solvent gave the crude product as a pale oily residue. Flash chromatography on silica gel eluting with 15:85 acetone mixture afforded the above-named product as a clear colorless glass in a yield of 0.75 g (69 percent of theoretical). ¹ H NMR (CDCl₃): d1.07-1.45 (m, 6H, both --CH₂ CH₃ 's), 2.61-3.62 (m, 7H), 3.78 (t, J=7 Hz, 2H,--NCH₂), 4.00-4.45 (m, 4H,--OCH₂ CH₃ and CH₂ Cl), 4.63 (s, 2H, --OCH₂ C═O), 6.85-7.13 (m, 3H, aromatic H's), 15.08 (broad s, 1H, enol H); (Compound 6).

    ______________________________________                                                       percent                                                          Analysis:       C          H      N                                            ______________________________________                                         Calc. for C.sub.21 H.sub.25 ClN.sub.2 O.sub.5 :                                                59.92      5.99   6.66                                         Found:          59.70      5.86   6.37                                         ______________________________________                                    

EXAMPLE VII 2-(1-(Ethoxyimino)propyl)-3-hydroxy-5-(N-benzyl-3-oxo-(2H)-1,4-benzoxazin-6-yl )-cyclohex-2-en-1-one ##STR36##

To 10 mL of methyl sulfoxide were added in sequence 1.4 g (3.5 mmol) of 2-propionyl-3-hydroxy-5-(N-benzyl-3-oxo-(2H)-1,4-benzoxazin-6-yl)cyclohex-2-en-1-one, 0.42 g (4.4 mmol) of ethoxyamine hydrochloride and 0.37 g (4.5 mmol) of anhydrous sodium acetate. The resulting mixture was stirred at ambient temperature for 3 hours. The reaction mixture was diluted with 50 mL of 0.5N HCl and extracted twice with 30 mL portions of ethyl acetate. The extracts were combined, dried over MgSO₄ and filtered. Evaporation off of the solvent gave an oily residue. The residue was dissolved in 50 mL of ether, washed with water, then an aqueous NaCl solution, dried over MgSO₄ and filtered. Evaporation off of the solvent gave a light amber glass which crystallized upon standing. The crude solid product was triturated in ether and the above-named product was isolated by filtration as a tan solid in a yield of 0.90 g (58 percent of theoretical). The product melted at 108°-110° C.; ¹ H NMR (CDCl₃): d1.05-1.41 (m, 6H, both --CH₂ CH₃ 's), 2.42-3.45 (m, 7H), 4.12 (q, J=7 Hz, 2H, --OCH₂ CH₃), 4.72 (2, 2H, --OCH₂ C═O), 5.20 (s, 2H, --CH₂ Ph), 6.75-7.08 (m, 3H, aromatic H's), 7.30 (s, 5H, --CH₂ Ph) ca. 14.7 (broad s, 1H, enol H); (Compound 7).

    ______________________________________                                                       percent                                                          Analysis:       C          H      N                                            ______________________________________                                         Calc. for C.sub.22 H.sub.28 N.sub.2 O.sub.5 :                                                  69.62      6.29   6.25                                         Found:          70.01      6.26   6.26                                         ______________________________________                                    

EXAMPLE VIII 2-(1-(Ethoxyimino)propyl)-3-hydroxy-5-(N-methoxymethyl-3-oxo-(2H)-1,4-benzoxazin-6-yl)cyclohex-2-en-1-one ##STR37##

To 40 mL of absolute ethanol were added in sequence 0.90 g (2.5 mmol) of 2-propionyl-3-hydroxy-5-(N-methoxymethyl-3-oxo-(2H)-1,4 benzoxazin-6-yl)-cyclohex-2-en-1-one, 0.31 g (3.2 mmol) of ethoxyamine hydrochloride and 0.26 g (3.2 mmol) of anhydrous sodium acetate. The resulting mixture was stirred at ambient temperature for 3 hours. The reaction mixture was then partitioned between 200 mL of water and 50 mL of dichloromethane. The organic layer was separated, dried over MgSO₄ and filtered. Evaporation off of the solvent gave the crude product as an oily residue which crystallized upon standing. The crude solid was triturated in warm ether and the above-named product was isolated by filtration as a white solid which melted at 101°-103° C. in a yield of 0.60 g (60 percent of theoretical). ¹ H NMR (CDCl₃): d1.05-1.52 (m, 6H, both --CH₂ CH₃ 's), 2.58-3.65 (m including 2H,OCH₂ C═0), 5.33 (s, 2H, --NCH₂ O), 6.85-7.30 (m, 3H, aromatic H's), 15.05 (broad s, 1H, enol H); (Compound 8).

    ______________________________________                                                       percent                                                          Analysis:       C          H      N                                            ______________________________________                                         Calc. for C.sub.21 H.sub.26 N.sub.2 O.sub.6 :                                                  62.67      6.51   6.96                                         Found:          62.46      6.43   6.68                                         ______________________________________                                    

EXAMPLE IX 2-(1-(Ethoxyimino)propyl)-3-hydroxy-5-(N-(3-chloropropyl)-3-oxo-(2H)-1,4-benzoxazin-6-yl)cyclohex-2-en-1-one ##STR38##

To 50 mL of absolute ethanol were added in sequence 1.6 g (4.1 mmol) of 2-propionyl-3-hydroxy-5-(N-(3-chloropropyl)-3-oxo-(2H)-1,4-benzoxazin-6-yl)-cyclohex-2-en-1-one, 0.32 g (3.4 mmol) of ethoxyamine hydrochloride and 0.27 g (3.3 mmol) of anhydrous sodium acetate. The resulting mixture was stirred at ambient temperature for 2.5 hours. The reaction mixture was then diluted with 200 mL of water and extracted twice with 50 mL portions of dichloromethane. The extracts were combined, dried over MgSO₄ and filtered. Evaporation off of the solvent gave the crude product as a yellow oily residue. Flash chromatography on silica gel eluting with 20 percent acetone/hexane afforded the above-named product as a pale glassy oil in a yield of 1.0 g (56 percent of theoretical). ¹ H NMR (CDCl₃): d1.05-1.43 (m, 6H, both --CH₂ CH₃ 's), 2.15 (p, J=7 Hz, 2H,--CH₂ CH₂ Cl and --CH₂ Cl), 4.57 (s, 2H, --OCH₂ C═O), 6.83-7.00 (m, 3H, aromatic H's), 14.9 (broad s, 1H, enol H); (Compound 9).

    ______________________________________                                                       percent                                                          Analysis:       C          H      N                                            ______________________________________                                         Calc. for C.sub.22 H.sub.27 ClN.sub.2 O.sub.5 :                                                60.75      6.26   6.44                                         Found:          60.92      6.08   6.37                                         ______________________________________                                    

EXAMPLE X 2-(1-(Ethoxyimino)-propyl )-3-hydroxy-5-(2-methyl-3-oxo-(2H, 4H)-1,4-benzoxazin-6-yl)cyclohex-2-en- 1-one ##STR39##

A slurry of 1.0 g (3.0 mmol) of 2-(1-propionyl)-3-hydroxy-5-(2-methyl-3-oxo-(2H,4H)-1,4-benzoxazin-6-yl)cyclohex-2-en-1-one in 35 mL of absolute ethanol was treated with 0.37 g (3.9 mmol) of ethoxyamine hydrochloride and 0.32 g (3.9 mmol) of anhydrous sodium acetate. The resulting heterogeneous mixture was stirred at ambient temperature for 6 hours. The reaction mixture was then diluted with mL of 0.2N HCl and extracted twice with 30 mL portions of dichloromethane. The extracts were combined, dried over MgSO₄ and filtered. Evaporation off of the solvent gave the crude product as a solid residue. The solid was triturated in warm ether and filtered to afford the above-named product as a beige solid which melted at 144°-146° C. in a yield of 0.90 g (81 percent of theoretical). ¹ H NMR (CDCl₃): d1.05-1.50 (m, 6H, --N--C═CH₂ CH₃ and OCH₂ CH₃), 2.61-3.56 (m, 7H), 4.18 (q, J=7 Hz, 2H,--OCH₂ CH₃), 4.71 (q, J=8 Hz, 1H,--OCHC═O), 6.72-7.05 (m, 3H, aromatic H's), 9.80 (broad s, 1H, --N--H), 15.1 (broad s, 1H, enol --O--H); (Compound 10).

    ______________________________________                                                       percent                                                          Analysis:       C          H      N                                            ______________________________________                                         Calc. for C.sub.20 H.sub.24 N.sub.2 O.sub.5 :                                                  64.50      6.50   7.52                                         Found:          64.56      6.49   7.10                                         ______________________________________                                    

EXAMPLE XI 2-(1-(Ethoxyimino)propyl)-3-hydroxy-5-(N-(2-propynyl)-3-oxo-(2H)-1,4-benzoxazin-6-yl)cyclohex-2-en-1-one ##STR40##

To 50 mL of methyl sulfoxide were added in sequence 2.2 g (6.2 mmol ) of 2-propionyl-3-hydroxy-5-(N-(2-propynyl)-3-oxo-(2H)-1,4-benzoxazin-6-yl)cyclohex-2-en-1-one, 0.70 g (7.4 mmol) of ethoxyamine hydrochloride and 0.60 g (7.3 mmol) of anhydrous sodium acetate. The resulting mixture was stirred at ambient temperature for 3.5 hours. The reaction mixture was then diluted with 400 mL of 0.2N HCl and extracted four times with 20 mL portions of dichloromethane. The extracts were combined, washed with aqueous NaCl, dried over MgSO₄ and filtered through a short pad of silica gel. Evaporation off of the solvent gave the crude product as a light yellow glass, which solidified upon standing. The solid was triturated in ether and the product isolated by filtration which afforded the above-named product as a white solid which melted at 100°-102° C. in a yield of 1.3 g (53 percent of theoretical). ¹ H NMR (CDCl₃): d1.08-1.47 (m, 6H, both --CH₂ CH₃ 's), 2.31 (t, J=2 Hz, 1H,--C--CH), 2.62-3.64 (m, 7H), 4.17 (q, J=7 Hz, 2H, OCH₂ CH₃), 4.67 (s, 2H, --OCH₂ C═O), 4.74(d, J=2 Hz, 2H,--NCH₂), 6.87-7.12 (m, 3H, aromatic H's), 15.10 (broad s, 1H, enol H); (Compound 11).

    ______________________________________                                                       percent                                                          Analysis:       C          H      N                                            ______________________________________                                         Calc. for C.sub.22 H.sub.24 N.sub.2 O.sub.5 :                                                  66.65      6.10   7.07                                         Found:          66.30      6.35   7.04                                         ______________________________________                                    

EXAMPLE XII 2-(1-(Ethoxyimino)propyl)-3-hydroxy-5-(N-(3-methylpropyl)-3-oxo-(2H)-1,4-benzoxazin-6-yl)cyclohex-2-en-1-one ##STR41##

To 125 mL of absolute ethanol were added in sequence 1.5 g (4.0 mmol) of 2-propionyl-3-hydroxy-5-(N-(3-methylpropyl)-3-oxo-(2H)-1,4-benzoxazin-6-yl)-cyclohex-2-en-1-one, 0.50 g (5.2 mmol) of ethoxyamine hydrochloride and 0.40 g (4.9 mmol) of anhydrous sodium acetate. The resulting mixture was stirred at ambient temperature for 16 hours. The reaction mixture was then diluted with 400 mL of 0.1N HCl and extracted twice times with 50 mL portions of dichloromethane. The extracts were combined, dried over MgSO₄ and filtered. Flash chromatography on silica gel eluting with 10 percent acetone/hexane afforded the above-named product as a clear glassy oil in a yield of 1.3 g (78 percent of theoretical). E¹ H NMR (CDCl₃): d0.85-1.50 (m including d, 6H, J=7 Hz, at 0.96 for --CH(CH₃)₂, 12H, both --CH₂ CH₃ 's), 1.87- 2.37 (m, 1H,--CH(CH₃)₂), 2.61-3.62 (m, 7H), 3.85 (d, J=7 Hz, 2H, --NCH₂), 4.18 (q, J=7 Hz, 2H, --OCH₂ CH₃), 4.64(s, 2H, --OCH₂ C═O), 6.83-7.12 (m, 3H, aromatic H's), 15.10 (broad s, 1H, enol H); (Compound 12).

    ______________________________________                                                       percent                                                          Analysis:       C          H      N                                            ______________________________________                                         Calc. for C.sub.23 H.sub.30 N.sub.2 O.sub.5 :                                                  66.64      7.30   6.76                                         Found:          66.40      7.72   6.81                                         ______________________________________                                    

By following the hereinabove procedures of the above set forth examples, employing the appropriate starting cyclohex-2-en-1-one and amine reactants, the following compounds in Table III are prepared.

    TABLE III       ##STR42##          Elem. Analysis Cmpd  Calc'd/Found No. R R.sup.1 R.sup.2 R.sup.3      (R.sup.4).sub.n R.sup.5 R.sup.6 R.sup.7 Q M.P.°       C. C H N            10-R H ethyl ethyl H H H (R)-methyl H 6 147-149      64.50 6.50 7.52            64.59 6.71 7.30 10-S H ethyl ethyl H H H      (S)-methyl H 6 144-146.5 64.50 6.50 7.52            64.43 6.40 7.31 13 H      ethyl ethyl H H methyl methyl H 6 oil 65.27 6.78 7.25            65.32      6.88 7.61 14 H ethyl ethyl H H CH.sub.2 CHCH.sub.2 methyl H 6 oil 66.97      6.84 6.79            67.17 7.07 6.69 15 H ethyl ethyl H H (CH.sub.2).sub.      2 Cl methyl H 6 oil 60.75 6.26 6.44            60.83 6.34 6.36 16 H      ethyl ethyl H H (CH.sub.2).sub.2       OH methyl H 6 oil 62.10.sup.a 6.87.sup.a 6.59.sup.a       OH      62.12.sup.a 6.46.sup.a 6.71.sup.a 17 H CH.sub.2 CHCH.sub.2 ethyl H H H H H       6 138-139.5 64.85 5.99 7.56            64.72 6.15 7.56 18 H ethyl            n-propyl H H H H H 6 142.6-143.5 64.50 6.50 7.52            64.85      6.71 7.51 19 H CH.sub.2       CHCH.sub.2                                       n-propyl H H H H H 6      128-128.6 65.61 6.29 7.29            65.58 6.48 7.25 20 H trans- ethyl H H       H H H 6 142-144.5 59.33 5.23 6.92   CH.sub.2 CHCHCl         59.49 5.34      6.72 21 H trans-      n-propyl H H H H H 6 152-155 60.21 5.53 6.69   CH.sub.2 CHCHCl      60.09 5.69 6.61 22 H CH.sub.2 CHCH.sub.2 methyl H H H H H 6 167-169      64.03 5.66 7.86            64.20 5.91 8.21 23 H trans- methyl H H H H H      6 159-162 58.39 4.90 7.17   CH.sub.2 CHCHCl         58.12 4.97 7.42 24 H      ethyl methyl H H H H H 6 178-181 62.78 5.85 8.14           (dec.) 62.78      6.23 8.45 25 H ethyl ethyl H H H ethyl H 6 143.145 65.26 6.78 7.25           65.59 7.01 6.87 26 H ethyl ethyl H H H phenyl H 6 201-203 69.11      6.03 6.45            69.35 6.33 6.15 27 H ethyl ethyl H H trans- H H 6      118-120 61.04 5.82 6.47       CH.sub. 2 CHCHCl     61.15 6.00 6.46      CH       CHCl 28 H ethyl ethyl H H H OCH(CH.sub.3).sub.2 H 6 132-135      61.66.sup.b 6.90.sup.b 6.54.sup.b            61.70.sup.b 6.81.sup.b      6.47.sup.b 29 H ethyl      n-propyl H H H methyl H 6 133-135 65.27 6.78 7.25            65.02 6.72      7.05 30 H trans-      n-propyl H H H methyl H 6 117-121 61.04 5.82 6.47   CH.sub.2 CHCHCl         60.80 5.87 6.56 31 H ethyl ethyl H 7-methyl H methyl H 6 1.82-1.84.5      65.27 6.78 7.25            65.33 7.01 6.96 32 H ethyl ethyl H H H methyl H       7 159-160 64.50 6.50 7.52            64.46 6.69 7.38 33 H ethyl ethyl H H       H CH.sub.2 OC.sub.2 H.sub.5 H 6 161.5-163 63.45 6.78 6.73      (dec.) 63.69 6.69 6.49 34 H ethyl ethyl H  H H R.sup.6, R.sup.7 -- 6      144-146 -- -- --        together is   (dec.)        CH.sub.2 35 H ethyl      ethyl H H H CH.sub.2 OCH.sub.3 H 6 150-151.5 62.70 6.51 6.96      (dec.) 63.16 6.65 7.22 36 H ethyl ethyl H H H      n-propyl H 6 194-196 66.00 7.05 7.00            65.87 7.22 7.00 37 H      ethyl ethyl H H H OCH.sub.3 H 6 150-151.5 62.70 6.51 6.96      (dec.) 63.16 6.65 7.22 38 H ethyl ethyl H H H methyl methyl 6 140-141      65.27 6.78 7.25           (dec.) 65.01 6.81 7.06 39 H ethyl ethyl H 7-Cl H       methyl H 6 177 59.04 5.70 6.89           (dec.) 58.82 5.68 6.85 40 H      trans- ethyl H H H methyl methyl 6 130-132 58.60.sup.c 6.04.sup.c      6.21.sup.c   CH.sub.2      a = calculated as a 0.50 H.sub.2 O hydrate.      b = calculated as a 0.67 H.sub.2 O hydrate.      c = calculated as a 1.00 H.sub.2 O hydrate.

EXAMPLE XIII 2-Propionyl-3-hydroxy-5-(3-oxo-(2H, 4H)-1,4-benzoxazin-6-yl)cyclohex-2-en-1-one ##STR43##

A solution of sodium ethoxide was prepared by dissolving 1.5 g (0.065 mol) of sodium metal in 250 mL of absolute ethanol. To this solution was added 9.6 g (0.027 mol) of 2-propionyl-3-hydroxy-5-(3-(N-2-chloroacetyl)amino-4-hydroxyphenyl)cyclohex-2-en-1-one in solid portions. The mixture was heated at reflux for 45 minutes, cooled to room temperature and poured into 600 mL of ice cold 0.2N HCl. The precipitate which formed was recovered by filtration to give the above-named product, as a light gray solid, in a yield of 7.9 g (93 percent of theoretical). The product melted at 207.5°-210° C.; ¹ H NMR (1:1 CDCl₃ -DMSO-d₆): d1.08 (t, J=7 Hz, 3H, --CH₃), 2.52-3.70 (m, 7H), 4.52 (s, 2H, --CH₂), 6.86 (s, 3H, aromatic H's), 10.55 (broad s, 1 H, --N--H), enol O--H not observed.

EXAMPLE XIV 2-Propionyl-3-hydroxy-5-(N-(2-propenyl)-3-oxo-(2H, 4H)-1,4-benzoxazin-6-yl )-cyclohex-2-en-1-one ##STR44##

Sixty percent sodium hydride in mineral oil 0.60 g (15 mmol NaH) was washed once with 15 mL of hexane, decanting via pipette. To this was added 1.6 g (5.1 mmol) of 2-propionyl-3-hydroxy-5-(3-oxo-(2H, 4H)-1,4-benzoxazin-6-yl)cyclohex-2-en-1-one in solid portions. The mixture was stirred at room temperature for 15 minutes, treated with 1.4 g (12 mmol) of allyl bromide and stirred at room temperature for 30 minutes. The mixture was poured into 100 mL of ice cold 0.2N HCl and extracted twice with 30 mL portions of a 5:1 ether-ethyl acetate mixture. The extracts were combined, washed with water, an aqueous NaCl solution, dried over MgSO₄, filtered and the solvent evaporated off to give the crude product, as a yellow solid. Recrystallization from ethanol afforded the above-named product in a yield of 1.4 g (77 percent of theoretical). The product melted at 129°-131.5° C.; .sup. 1 H NMR (CDCl₃): d1.10 (t, J=7 Hz, 3H, --CH₃), 2.55-3.56 (m, 7H), 4.52-4.73 (m including s at 4.50 for OCH₂, 4H, --NCH₂), 5.12-5.42 (m, 2H, --CH═CH₂), 5.70-6.15 (m, 1H, --CH═CH₂), 6.82-7.10 (m, 3H, aromatic H's), 18.10 (broad s, 1H, enol O--H).

    ______________________________________                                                       percent                                                          Analysis:       C          H      N                                            ______________________________________                                         Calc. for C.sub.20 H.sub.21 NO.sub.5 :                                                         67.59      5.96   3.94                                         Found:          67.21      5.96   3.77                                         ______________________________________                                    

The compounds of the present invention have been found to be suitable for use in methods for the pre- and postemergent control of many annual and perennial grassy weeds,. In addition, certain of the present compounds are sufficiently tolerated by most broadleaf crops, such as, for example, soybeans, cotton and sugarbeet to allow for the postemergent control of grassy weeds growing among said crops. Further, certain of the compounds are sufficiently tolerated by certain grass crops, such as, for example, corn to allow for the postemergent control of grassy weeds growing among said crop.

It is to be noted that while all compounds have herbicidal activity, each compound/active ingredient may have a slightly different degree of herbicidal activity on different plants. Some compounds may be more active in the control of one specific weed species than another and some compounds may be more selective toward one crop species than another. Many of these compounds are unique because of their systemic action and because of the very low levels of chemical required to control the grassy weeds.

For such uses, unmodified active ingredients of the present invention can be employed. However, the compounds may be prepared in formulations/compositions as dusts, wettable powders, flowable concentrates, or emulsifiable concentrates by the admixture of the active compounds with inert materials, known in the art as inert agricultural adjuvants and/or carriers, in solid or liquid form.

Thus, for example, the active compound(s) can be admixed with one or more additives including organic solvents, petroleum distillates, water or other liquid carriers, surface active dispersing agents, and finely-divided inert solids. For example, an active ingredient can be dispersed on a finely-divided solid and employed herein as a dust or granule. Also, the active ingredients, as liquid concentrates or solid compositions comprising one or more of the active ingredients, can be dispersed in water, typically with aid of a wetting agent, and the resulting aqueous dispersion employed as a spray. In other procedures, the active ingredients can be employed as a constituent of organic liquid compositions, oil-in-water and water-in-oil emulsions or water dispersions, with or without the addition of wetting, dispersing, or emulsifying agents.

The herbicidally effective concentration of the active ingredients in solid or liquid compositions generally is from about 0.0003 to about 95 percent by weight or more. Concentrations from about 0.05 to about 50 percent by weight are often employed.

The compound can be employed in the form of diluted flowable compositions or a wettable powder composition containing 2 to 10,000 ppm of one or more of the compounds, preferably 10 to 600 ppm are employed. When the carrier contains a surface active agent, from about 0.1 to about 20 percent by weight of the active ingredient is advantageously employed. Depending upon the concentration in the composition, such augmented compositions are adapted to be employed for the control of the undesirable plants or employed as concentrates and subsequently diluted with additional inert carrier, e.g., water to produce the ultimate treating compositions.

Similarly, the toxicant products can be compounded with a suitable water-immiscible inert organic liquid and a surface active dispersing agent to produce an emulsifiable concentrate which can be further diluted with water and oil to form spray mixtures in the form of oil-in-water emulsions which may optionally contain water miscible organic co-solvents to improve the physical properties of the formulation. In such compositions, the carrier comprises an aqueous emulsion, i.e., a mixture of inert water-immiscible solvent and optional water miscible organic co-solvent, emulsifying agent and water. In such compositions, the active ingredient is usually present in a concentration from about 5 to about 98 weight percent.

In the preparation of dust, or wettable powder compositions, the toxicant products can be compounded with any of the finely-divided solids, such as prophyllite, talc, chalk, gypsum, fuller's earth, bentonitc, attapulgite, starch, casein, gluten, or the like. In such operations, the finely-divided carrier is ground or mixed with the toxicant or wet with a solution of the toxicant in a volatile organic solvent. Also, such compositions when employed as concentrates can be dispersed in water, with or without the aid of dispersing agents to form spray mixtures. With dusts, good results can usually be obtained employing compositions containing from about 0.1 to about 2.0 percent or more by weight of toxicant.

Granular formulations are usually prepared by impregnating a solution of the toxicant in a volatile organic solvent onto a bed of coarsely-divided attapulgite, bentonitc, diatomite, or the like.

Emulsifiers which can be advantageously employed herein can be readily determined by those skilled in the art and include various nonionic, anionic and cationic emulsifiers, or a blend of two or more of said emulsifiers.

Examples of nonionic emulsifiers useful in preparing the emulsifiable concentrates include the polyalkylene glycol ethers and condensation products of alkyl and aryl phenols, aliphatic alcohols, aliphatic amines or fatty acids with ethylene oxide, propylene oxide or mixtures of ethylene and propylene oxides such as the ethoxylated alkyl phenols and carboxylic esters solubilized with the polyol or polyoxyalkylene.

Anionic emulsifiers include the oil-soluble salts (e.g., calcium) of alkylaryl sulphonic acids, oil soluble salts of sulphated polyglycol ethers and appropriate salts of phosphated polyglycol ether. Cationic emulsifiers include quaternary ammonium compounds and fatty amines.

The preferred emulsifiers will depend upon the nature of the emulsifiable concentrate. For example, an emulsifiable concentrate of a compound of Formula I containing 200 g/L of the compound in xylene may require a blend of an ethoxylated nonyl phenol and calcium dodecyl benzene sulphonate to function effectively, whereas a similar emulsifiable concentrate of the oleate salt of a compound of Formula I soluble in an aliphatic organic solvent will require a considerably different emulsification system.

Representative organic liquids which can be employed in preparing the emulsifiable concentrates of the present invention are the aromatic liquids such as xylene; propyl benzene fractions; or mixed naphthalene fractions; mineral oils substituted aromatic organic liquids such as dioctyl phthalate; kerosene; butene; dialkyl amides of various fatty acids, particularly the dimethyl amides of fatty glycols and glycol derivatives such as the n-butyl ether, ethyl ether or methyl ether of diethylene glycol, the methyl ether of triethylene glycol. Mixtures of two or more organic liquids are also often suitably employed in the preparation of the emulsifiable concentrate. The preferred organic liquids are xylene, and propyl benzene fractions, with xylene being most preferred.

The surface active dispersing agents are usually employed in liquid compositions and in the amount of from 0.1 to 20 percent by weight of the combined weight of the dispersing agent and active compound.

Especially, these active compositions may contain adjuvant surfactants to enhance the deposition, wetting and penetration of the composition onto the target crop and organism. These adjuvant surfactants may optionally be employed as a component of the formulation or as a tank mix. The amount of adjuvant surfactant will vary from 0.01 percent to 2.0 percent v/v based on a spray-volume of water, preferably 0.05 to 0.5 percent. Suitable adjuvant surfactants include ethoxylated nonyl phenols, ethoxylated synthetic or natural alcohols, salts of the esters of sulphosuccinic acids, ethoxylated organosilicones, ethoxylated fatty amines and blends of surfactant with mineral or vegetable oils.

In further embodiments, the compounds of the present invention or compositions containing the same, can be advantageously employed in combination with one or more additional pesticidal compounds. Such additional pesticidal compounds may be insecticides, nematocides, miticides, arthropodicides, herbicides, fungitides or bactericides that are compatible with the compounds of the present invention in the medium selected for application and not antagonistic to the activity of the present compounds. Accordingly, in such embodiments, the pesticidal compound is employed as a supplemental toxicant for the same or for a different pesticidal use or as an additament. The compounds in combination can generally be present in a ratio of from 1 to 100 parts of the compound of the present invention with from 100 to 1 part of the additional compound(s).

The active ingredients of the present invention have been found to possess desirable postemergent activity against grassy weeds such as foxtail, barnyard grass, wild oat, Johnson grass and the like, while showing high selectivity to important broadleaf crops such as cotton, sunflower, sugarbeet, rape and soybeans and grassy crops such as corn. These compounds are also effective in selectively controlling perennial grassy weeds such as Johnson grass and the like in the presence of said crop plants.

The exact amount of the active material to be applied is dependent not only on the specific active ingredient being applied, but also on the particular action desired, the plant species to be controlled and the stage of growth thereof as well as the part of the plant to be contacted with the toxic active ingredient. Thus, all of the active ingredients of the present invention and compositions containing the same may not be equally effective at similar concentrations or equally effective against the same plant species.

In preemergent operations a dosage rate of 0.01 to 10 lbs/acre (0.011 to 11.2 kgs/hectare), preferably 0.05 to 2.0 lbs/acre (0.056 to 2.25 kgs/hectare) and most preferably 0.1 to 1 lb/acre (0.11 to 1.12 kgs/hectare ) is generally employed.

In postemergent operations a dosage of about 0.01 to about 20 lbs/acre (0.056-22.4 kg/hectare) is generally applicable, although not all compounds are equally effective and some weeds are more difficult to control. Thus, a dosage rate in the range of about 0.01 to about 1.0 lb/acre (0.01-1.12 kg/hectare) is preferred in postemergent control of annual grassy weeds, while about 0.05 to about 5 lbs/acre (0.056-5.6 kg/hectare) is a preferred dosage range for the postemergent control of perennial grassy weeds. In applications to tolerant crops a weed controlling but less than crop damaging amount of from about 0.005 to about 1.0 lb/acre (0.0056 to 1.12 kgs/hectare) is generally employed.

Representative formulations/compositions of the present invention include the following:

                  TABLE IV                                                         ______________________________________                                         Emulsifiable Concentrate                                                                       weight percent                                                                 of total                                                       Ingredient      composition                                                    ______________________________________                                         Compound No. 3  6.4                                                            Atlox ™ 3454a                                                                               5.4                                                            Atlox ™ 3413a                                                                               5.4                                                            Aromatic 100    41.4                                                           Cyclohexanone   41.4                                                           ______________________________________                                    

                  TABLE V                                                          ______________________________________                                                          weight percent                                                                 of total                                                      Ingredient       composition                                                   ______________________________________                                         Compound No. 4   5.0                                                           Xylene           65.0                                                          Hallcomid ™ M8-10.sup.b                                                                      20.0                                                          Tenseofix ™ B7438.sup.c                                                                      3.0                                                           Tenseofix ™ B7453.sup.c                                                                      3.0                                                           Ethomeen ™ C25.sup.d                                                                         4.0                                                           ______________________________________                                    

                  TABLE VI                                                         ______________________________________                                         Wettable Powder                                                                                weight percent                                                                 of total                                                       Ingredient      composition                                                    ______________________________________                                         Compound No. 3  25.0                                                           Barden AG clay  50.0                                                           Celite ™ 209.sup.e                                                                          17.0                                                           Nekal ™ BA-75.sup.f                                                                         3.0                                                            Daxad ™ 21.sup.g                                                                            5.0                                                            ______________________________________                                    

                  TABLE VII                                                        ______________________________________                                                         weight percent                                                                 of total                                                       Ingredient      composition                                                    ______________________________________                                         Compound No. 4  50.0                                                           Barden AG clay  21.0                                                           Celite ™ 209.sup.e                                                                          21.0                                                           Polyfon ™ H.sup.h                                                                           5.0                                                            Aerosol ™ OTB.sup.i                                                                         3.0                                                            ______________________________________                                    

                  TABLE VIII                                                       ______________________________________                                         Flowable Concentrate                                                                            weight percent                                                of total                                                                       Ingredient       composition                                                   ______________________________________                                         Compound No. 3   12.0                                                          Pluronic ™ P105.sup.j                                                                        2.0                                                           Darvan ™ #1.sup.k                                                                            0.5                                                           Dow Corning FG10.sup.m                                                                          1.0                                                           VeeGum ™.sup.n                                                                               0.3                                                           Kelzan ™.sup.o                                                                               0.04                                                          Propylene glycol 4.5                                                           water            79.66                                                         ______________________________________                                    

                  TABLE IX                                                         ______________________________________                                                               weight                                                                         percent of                                                                     total                                                    Ingredient            composition                                              ______________________________________                                         Compound No. 4        12.0                                                     Sun Spray ™ 11N oil.sup.p                                                                         72.7                                                     Bentone ™ 38.sup.q 1.0                                                      solution of 95% methanol/5% water                                                                    0.3                                                      Emulsogen ™ M.sup.r                                                                               12.0                                                     Agrimul ™ 70A.sup.s                                                                               2.0                                                      ______________________________________                                    

                  TABLE X                                                          ______________________________________                                         Dusts                                                                                          weight percent                                                                 of total                                                       Ingredient      composition                                                    ______________________________________                                         Compound No. 3  5.0                                                            Barden clay     80.0                                                           Celite ™ 209.sup.e                                                                          15.0                                                           ______________________________________                                    

                  TABLE XI                                                         ______________________________________                                                         weight percent                                                                 of total                                                       Ingredient      composition                                                    ______________________________________                                         Compound No. 4  2.5                                                            Barden clay     82.5                                                           Celite ™ 209.sup.e                                                                          15.0                                                           ______________________________________                                    

In the above Tables:

Aromatic 100=an aromatic hydrocarbon solvent with a Flash point above 101° F.TCC, a product of Exxon Corp.

a=an anionic/nonionic emulsifier product of Atlas Chemical Industries, Inc.

b=N,N'-dimethyl amides of fatty acid, a product of The C. P. Hall Co.

c=blends of calcium dodecylbenzenesulfonates with nonylphenol propylene oxide/ethylene oxide block copolymers, a product, of Tenseia, Inc.

d=is a proprietary material of Akzo Chemicals, Inc.

e=diatomaceous earth, a product of Johns-Manville Products, Inc.

f=sodium alkylnaphthalene sulfonate, an anionic emulsifier product of GAF Corp.

g=a polyaryl and substituted benzoid alkylsulfonic acid, a product of W. R. Grace & Co.

h=sugar-free, sodium based sulfonates of Kraft lignin is a proprietary material of West Virginia Pulp and Paper Co.

i=dioctyl ester of sodium sulfosuccinic acid, a product of American Cyanamid Co.

j=condensate of ethylene oxide with hydrophobic bases formed by condensing propylene oxide with propylene glycol, a product of BASF Corp.

k=sodium salts of polymerized alkylnaphthalene sulfonic acid, an anionic surfactant of R. T. Vanderbilt Co., Inc.

m=is a proprietary material of Dow Corning Corp.

n=colloidal magnesium aluminum silicate, a product of R. T. Vanderbilt Co., Inc.

o=a polysaccharide known as xanthan gum, a product of Kelco Co.

p=a phytobland mineral oil also known as spray oil, a product of Sun Oil Co.

q=organic derivative of hydrous magnesium aluminum silicate minerals, a product of National Lead Co.

r=a nonionic ethoxylated derivative-a mineral oil emulsifier of American Hoechst Corp.

s=alkyl aryl polyether alcohol, a product of Henkel Corp.

The following examples illustrate the herbicidal effects of the compounds of this invention.

The plant species employed in these evaluations were as follows:

                  TABLE XII                                                        ______________________________________                                         Common Name       Scientific Name                                              ______________________________________                                         Barnyardgrass     Echinochloa crusgalli                                        Broadleaf signalgrass                                                                            Brachiaria platyphylla                                       Corn              Zea maize                                                    Cotton            Gossypium hirsutum                                           Crabgrass         Digitaria sanguinalis                                        Fall Panicum      Panicum dichotomiflorum                                      Giant Foxtail     Setaria faberi                                               Green Foxtail     Setaria viridis                                              Johnsongrass      Sorghum halepense                                            Wild Oat          Avena fatua                                                  Oilseed rape      Brassica napus                                               Sorghum           Sorghum bicolor                                              Soybean           Glycine max                                                  Sugarbeet         Beta vulgaris                                                Sunflower         Helianthus annuus                                            Yellow Foxtail    Setaria lutescens                                            ______________________________________                                    

EXAMPLE XV Postemergent Evaluation

In representative operations, each compound to be utilized in a series of tests is dissolved in acetone to one-half of the final volume (twice the final concentration) to be used and the acetone solution in each case is admixed with an equal volume of an aqueous solution composed of 78 percent water, 20 percent isopropanol, 2 percent Atplus™ 411f (a proprietary crop oil material of ICI Americas Inc., Wilmington, Del.) and 0.04 percent Triton™ X-155 (a nonionic surfactant which is an alkylaryl polyether alcohol, a proprietary material of Union Carbide Chem. & Plastic Co., Danbury, Conn.). The compositions, generally in the nature of an emulsion, were employed to spray separate respective plant species which had been grown in a greenhouse to a height of 2-6 inches in soil of good nutrient content. Sufficient amounts were employed to provide various application rates as listed in the table. The various beds were positioned side by side and exposed to substantially identical conditions of temperature and light. Each bed was maintained so as to prevent any interaction with test .compounds in different plant beds. Other plant beds were treated with an isopropanol/Atplus™ 411f/Triton™ X-155/water mixture containing no test compound to serve as controls. After treatment, the plants were maintained for about 2 weeks under greenhouse conditions conducive for good plant growth and watered as necessary. The specific plant species, test compound and dosage and the percent postemergent control obtained are set forth in Table XIII. Control refers to the reduction in growth compared to the observed results of the same untreated species. Note the "NT" means "not tested."

                                      TABLE XIII                                   __________________________________________________________________________                Percent Kill and Control of Plant Species                           Compound                                                                             Dosage          Soy-                                                                              Sugar- Giant                                                                              Johnson Barnyard                                                                             Wild                         Tested                                                                               in PPM                                                                              Cotton Rape                                                                               bean                                                                              beet   Foxtail                                                                            Grass   Grass Oat                          __________________________________________________________________________     1     125  0      0   0  0      100 100     100   100                          2     125  0      0   0  0      100 100     100   90                           3     125  0      0   0  0      80  100     100   100                          4     125  0      0   0  0      90  90      100   100                          5     125  0      0   0  0      85  100     98    85                           6     125  0      0   0  0      95  100     100   90                           7     125  0      0   0  0      65  70      90    30                           8     125  0      0   0  0      90  10*     100   90                                                               90 at 62.5 ppm;                                                                100 at 250 ppm                             9     125  0      0   0  0      80  70      100   80                           10    125  0      0   0  0      100 100     100   100                          10-R  125  0      0   0  0      95  100     100   95                           10-S  125  0      0   0  0      95  100     100   95                           11    125  40*    0   0  85*    85  100     100   85                                      0 at 62.5 ppm 0 at 62.5 ppm                                         12    125  0      0   0  0      40  85      95    90                           13    125  0      0   0  0      90  100     100   95                           14    125  0      0   0  0      75  100     100   100                          15    125  0      0   0  0      100 100     10*   100                                                                      100 at 62.5;                                                                   100 at 250                         16    125  0      0   0  0      100 100     100   90                           17    125  0      0   0  0      100 100     95    90                           18    125  0      0   0  0      100 100     100   100                          19    125  0      0   0  0      100 100     100   100                          20    125  0      0   0  0      100 100     100   100                          21    125  0      0   0  0      100 100     100   100                          22    125  0      0   0  0      100 100     100   90                           23    125  0      0   0  0      100 100     100   80                           24    125  0      0   0  0      100 100     100   90                           25    125  0      20* 0  0      100 100     100   90                                             0 at 62.5                                                    26    100  0      0   0  0      100 95      100   100                          27    125  0      0   0  0      98  100     100   80                           28    32.9 0      60  0  0      90  90      100   90                           29    125  0      0   0  0      88  100     100   100                          30    125  0      50  0  50     90  85      100   85                           31    125  0      0   0  0      95  100     100   95                           32    125  0      0   0  0      95  100     100   95                           __________________________________________________________________________      Compound 10 = racemic mixture; Compound 10R = R optical isomer; Compound       10S = S optical isomer                                                   

EXAMPLE XVI Postemergent Evaluation

In representative operations, each compound to be utilized in a series of tests is dissolved in acetone to one-third of the final volume to be used and the acetone solution in each case is brought up to the full volume with a solution composed of 98.0 percent water and 2.0 percent Dash™ (a spray tank adjuvant which is a mixture of petroleum hydrocarbons, alkyl esters and acids, anionic surfactants and inert materials, a proprietary material of BASF Corp., Parsippany, N.J.). The compositions, generally in the nature of an emulsion, were sprayed using a tracksprayer at a carrier volume equal to 20 gallons per acre, using an 8002 nozzle traveling at 2 mph and 40 psi, on separate respective plant species which had been grown in a greenhouse to a height of 2-6 inches in soil of good nutrient content. Sufficient amounts were employed to provide various application rates as listed in the table. The various beds were positioned side by side and exposed to substantially identical conditions of temperature and light. Each bed was maintained so as to prevent any interaction with test compounds in different plant beds. Other plant beds were treated with a acetone/water/Dash™ mixture containing no test compound to serve as controls. After treatment, the plants were maintained for about 2 weeks under greenhouse conditions conducive for good plant growth and watered as necessary. The specific plant species, test compound and dosage and the percent postemergent control obtained are set forth in Table XIV. Control refers to the reduction in growth compared to the observed results of the same untreated species.

                                      TABLE XIV                                    __________________________________________________________________________              Percent Kill and Control of Plant Species                             Compd.                                                                              Dosage Barnyard                                                                            Crab-                                                                              Fall Green                                                                              Giant                                                                              Yellow                                                                             Signal                                   Tested                                                                              in g/ha                                                                            Corn                                                                              Grass                                                                               grass                                                                              Panicum                                                                             Foxtail                                                                            Foxtail                                                                            Foxtail                                                                            Grass                                                                              Sorghum                              __________________________________________________________________________     10   2.19                                                                               0  90   30  100  55  55  65  75  80                                        4.38                                                                               0  90   50  95   60  50  75  70  90                                        8.75                                                                               10 90   60  95   95  90  95  85  90                                        17.50                                                                              10 95   85  95   100 95  95  100 95                                   10-R 2.19                                                                               15 35   0   NT   40  15  10  35  80                                        4.38                                                                               15 80   40  NT   80  70  25  85  90                                        8.75                                                                               15 90   50  NT   90  85  65  80  95                                   10-S 2.19                                                                               5  85   35  NT   80  25  35  30  70                                        4.38                                                                               15 90   80  NT   90  75  40  50  95                                   25   2.19                                                                               0  70   10  30   25  35  15  15  15                                        4.38                                                                               0  95   15  85   40  65  50  65  60                                        8.75                                                                               0  95   30  90   50  70  90  65  80                                        17.50                                                                              0  95   60  95   95  90  90  90  95                                        35.00                                                                              10 100  70  90   95  90  100 95  90                                   28   3.91                                                                               10 100  0   80   20  60  0   75  0                                         7.81                                                                               10 100  0   70   45  80  0   70  10                                        15.63                                                                              10 100  0   90   70  85  40  60  20                                        31.25                                                                              15 100  0   90   80  90  45  85  70                                   29   4.38                                                                               10 75   35  85   50  20  83  95  85                                        8.75                                                                               15 95   60  100  80  40  95  95  95                                   30   4.38                                                                               10 90   10  90   35  55  75  95  30                                   38   4.38                                                                               0  85   10  80   35  30  85  85  60                                        8.75                                                                               10 95   20  85   55  40  85  90  75                                        17.50                                                                              10 95   40  90   70  50  95  95  85                                        35.00                                                                              15 95   60  95   90  95  95  95  90                                   39   4.38                                                                               0  95   10  85   50  15  80  65  20                                        8.75                                                                               0  98   10  95   70  55  95  75  20                                        17.50                                                                              10 98   20  95   70  65  100 100 45                                        35.00                                                                              10 100  20  100  75  75  100 90  55                                   40   4.38                                                                               0  60   30  65   65  85  55  65  60                                        8.75                                                                               5  90   45  70   70  90  65  70  95                                        17.50                                                                              15 95   65  90   100 85  65  75  98                                   __________________________________________________________________________      g/ha = grams of active material per hectare; NT = not tested; Compound 10      = R optical isomer; Compound 10S = S optical isomer                      

EXAMPLE XVII Pre-Emergent Evaluation

In representative operations, each compound to be utilized in a series of tests is dissolved in acetone to one-half of the final volume (twice the final concentration) to be used and the acetone solution in each case is admixed with an equal volume of water containing 0.1 percent by weight of a nonionic surfactant TWEEN® 20 (a polyoxyethylene sorbitan monolaurate). The compositions, generally in the nature of an emulsion, were employed to spray seed beds of separate respective plant species which had been planted in soil of good nutrient content in a greenhouse. Sufficient amounts were employed to provide various application rates as listed in the table. The various beds were positioned side by side and exposed to substantially identical conditions of temperature and light. Each bed was maintained so as to prevent any interaction with test compounds in different seed beds. Other seed beds were treated with an acetone/TWEEN® 20/water mixture containing no test compound to serve as controls. After treatment, the seed beds were maintained for about three weeks under greenhouse conditions conducive for good plant growth and watered as necessary. The specific plant species, test compound and dosage and the percent postemergent control obtained are set forth in Table XV. Control refers to the reduction in growth compared to the observed results of the same untreated species.

                                      TABLE XV                                     __________________________________________________________________________                Percent kill and control of Plant Species                           Compound                                                                             Dosage         Soy- Sugar-                                                                              Sun- Giant Johnson                                                                             Barnyard                                                                            Wild                       Tested                                                                               in Kg/ha                                                                            Cotton                                                                              Rape bean beet flower                                                                              Foxtail                                                                              Grass                                                                               Grass                                                                               Oat                        __________________________________________________________________________     1     0.28 10*  0    35*  0    10*  70    80   60   70                                    0 at 0.14 0 at 0.14 0 at 0.14                                       2     0.28 20   NT   20*  0    10*  80    40   95   50                                              0 at 0.14 0 at 0.14                                       3     0.56 0    0    0    0    20*  100   99   100  60                                                        0 at 0.14                                       4     0.28 0    0    0    0    0    60*   50   100  0*                                                             100 at 0.56     50 at 0.56                 5     0.28 20*  20*  0    0    25*  100   100  100  80                                    0 at 0.14                                                                           0 at 0.14      0 at 0.14                                       6     0.28 10   0    30   0    20   40    80   100  80                         7     1.12 20*  10   0    0    0    80    70   100  70                                    0 at 0.56                                                           8     0.56 0    NT   40*  0    20*  100   20   100  70                                              0 at 0.28 0 at 0.28                                       9     0.56 0    0    0    0    0    50    50   100  50                         10    0.28 0    0    0    0    30*  100   80   100  30                                                        0 at 0.14                                       11    0.56 0    0    0    0    0    100   70   100  20                         12    1.12 0    0    20   0    0    100   40   100  85                         13    0.28 0    0    0    0    0    1000  95   100  100                        14    0.56 0    0    0    0    0    100   90   100  100                        15    0.56 0    0    0    30   20   98    75   100  80                         16    2.24 0    0    0    0    0    100   95   100  100                        17    0.28 30   0    30   0    20   20    100  50   50                         18    0.28 0    0    30   0    30   0*    50   100  430                                                            20 at 0.14                                 19    0.28 20*  0    20*  0    0*   30    30   100  20                                    0 at 0.07 0 at 0.14 0 at 0.14                                       20    0.28 0    0    40*  30*  10*  100   50   100  100                                             0 at 0.07                                                                           0 at 0.14                                                                           0 at 0.14                                       21    0.28 20*  0    NT   NT   20*  90    40   100  30                                    0 at 0.14           0 at 0.14                                       22    0.56 30*  10*  30*  20*  0    100   70   100  20                                    0 at 0.28                                                                           0 at 0.28                                                                           0 at 0.28                                                                           0 at 0.28                                            23    0.28 0    0    0    0    0    100   70   100  60                         24    0.28 0    0    0    NT   0    100   30   100  60                         25    1.12 0    0    0    0    0    100   95   100  100                        26    0.56 10*  0    0    0    35   100   100  100  90                                    0 at 0.28                                                           27    1.12 0    0    0    0    0    100   100  100  100                        29    0.28 85*  0    10*  20*  0    40    80   100  80                                    0 at 0.025                                                                               0 at 0.025                                                                          0 at 0.14                                            30    0.28 0    10   0    0    0    0     100  100  85                         31    0.56 0    0    10*  0    0    0     100  100  100                                             0 at 0.28                                                 32    0.56 20*  0    0    0    20*  100   100  100  98                                    0 at 0.28           0 at 0.28                                       33    0.28 0    0    0    0    0    90    60   100  75                         37    0.28 0    0    20   0    25   50    80   100  50                         39    0.56 0    0    0    0    20   50    50   100  80                         __________________________________________________________________________

Other compounds, not specifically exemplified, but within the scope of the present invention may also be employed in the same manner as set forth hereinabove to control grassy weeds, including non-listed grassy weeds growing in both broad-leafed and grassy crops with results commensurate to those described hereinabove.

Various modifications may be made in the present invention without departing from the spirit or scope thereof and it is understood that we limit ourselves only as defined in the appended claims. 

What is claimed is:
 1. A substituted cyclohexanedione compound corresponding to the formula ##STR45## ##STR46## Wherein D is attached in the 6 or 7 ring position and represents the radical ##STR47## R represents --H or acyl; R¹ represents C₁ -C₃ alkyl, C₃ -C₅ alkenyl, C₃ -C₅ haloalkenyl, arylalkenyl wherein aryl represents phenyl or pyridinyl substituted with from 0 to 4 halo or --CF₃ groups or mixtures thereof and alkenyl contains from C₂ -C₅ carbon atoms;R² represents C₁ -C₃ alkyl; R³ represents --H or --CH₃ ; R⁴ each independently represents --H, halo, C₁ -C₄ alkyl or C₁ -C₄ alkoxy; R⁵ represents --H, C₁ -C₄ alkyl, C₁ -C₄ haloalkyl, C₃ -C₅ alkenyl, C₃ -C₅ haloalkenyl, C₃ -C₅ alkynyl, C₃ -C₅ haloalkynyl, alkoxyalkyl wherein the alkoxy and alkyl group each contains from C₁ -C₄ carbon atoms or alkylthioalkyl wherein each alkyl group thereof contains from C₁ -C₄ carbon atoms; R⁶ represents R⁵, C₁ -C₄ alkoxy or aryl wherein aryl is phenyl or pyridinyl substituted with from 0-3 halogen or methyl groups; R⁷ represents --H or C₁ -C₄ alkyl; and n represents the integer 1, 2 or 3and the herbicidally acceptable organic and inorganic salts thereof.
 2. A compound as defined in Claim 1 wherein R is hydrogen.
 3. The compound as defined in Claim 2 which is 2-( 1-(Ethoxyimino)propyl)-3-hydroxy-5-(3-oxo-(2H, 4H)-1,4-benzoxazin-6-yl)cyclohex-2-en-1-one.
 4. The compound as defined in Claim 2 which is 2-(1-(Ethoxyimino)propyl)-3-hydroxy-5-(N-methyl-3-oxo-(2H)-1,4-benzoxazin-6-yl)cyclohex-2-en-1-one.
 5. The compound as defined in Claim 2 which is 2-(1-(Ethoxyimino)propyl)-3-hydroxy-5-(3-oxo-(2H, 4H)-1,4-benzoxazin-7-yl )cyclohex-2-en-1-one.
 6. The compound as defined in Claim 2 which is 2-(1-(2-Ethoxyimino)propyl)-3-hydroxy-5-(2-methyl-3-oxo-(2H, 4H)-1,4-benzoxazin-6-yl )cyclohex-2-en-1-one.
 7. The compound as defined in Claim 2 which is 2-(1-(2-Ethoxyimino)propyl)-3-hydroxy-5-(2,2-dimethyl-3-oxo-(2H, 4H)-1,4-benzoxazin-6-yl)cyclohex-2-en-1-one.
 8. The compound as defined in Claim 2 which is 2-(1-(2-Ethoxyimino)propyl)-3-hydroxy-5-(2-phenyl-3-oxo-(2H, 4H)-1,4-benzoxazin-6-yl)cyclohex-2-en-1-one.
 9. A herbicidal composition which comprises an inert carrier in intimate admixture with a herbicidally effective amount of an active ingredient which is a substituted cyclohexanedione compound corresponding to the formula ##STR48## Wherein D is attached in the 6 or 7 ring position and represents the radical ##STR49## R represents --H, acyl or an alkali metal cation; R¹ represents C₁ -C₃ alkyl, C₃ -C₅ alkenyl, C₃ -C₅ haloalkenyl, arylalkenyl wherein aryl represents phenyl or pyridinyl substituted with from 0 to 4 halo or --CF₃ groups or mixtures thereof and alkenyl contains from C₂ --C₅ carbon atoms;R² represents C₁ -C₃ alkyl; R³ represents --H or --CH₃ ; R⁴ each independently represents --H, halo, C₁ -C₄ alkyl or C₁ -C₄ alkoxy; R⁵ represents --H, C₁ -C₄ alkyl, C₁ -C₄ haloalkyl, C₃ -C₅ alkenyl, C₃ -C₅ haloalkenyl, C₃ -C₅ alkynyl, C₃ -C₅ haloalkynyl, alkoxyalkyl wherein the alkoxy and alkyl group each contains from C₁ -C₄ carbon atoms or alkylthioalkyl wherein each alkyl group thereof contains from C₁ -C₄ carbon atoms; R⁶ represents R⁵, C₁ -C₄ alkoxy or aryl wherein aryl is phenyl or pyridinyl substituted with from 0-3 halogen or methyl groups. R⁷ represents --H or C₁ -C₄ alkyl; and n represents the integer 1, 2 or 3 and the herbicidally acceptable organic and inorganic salts thereof.
 10. A composition as defined in Claim 8 wherein R is hydrogen.
 11. The composition as defined in Claim 10 wherein the active ingredient is 2-(1-(Ethoxyimino)-propyl)-3-hydroxy-5-(3-oxo-(2H, 4H)-1,4-benzoxazin-6-yl)cyclohex-2-en-1-one.
 12. The composition as defined in Claim 10 wherein the active ingredient is 2-(1-(Ethoxyimino)-propyl)-3-hydroxy-5-(N-methyl-3-oxo-(2H) -1,4-benzoxazin-6-yl)cyclohex-2-en-1-one.
 13. The composition as defined in Claim 10 wherein the active ingredient is 2-(1-(Ethoxyimino)-propyl)-3-hydroxy-5-(3-oxo-(2H, 4H)-1,4-benzoxazin-7-yl) cyclohex-2-en-1-one.
 14. The composition as defined in Claim 10 wherein the active ingredient is 2-(1-(2-Ethoxyimino)propyl)-3-hydroxy-5-(2-methyl-3-oxo-(2H, 4H ) -1,4-benzoxazin-6-yl)cyclohex-2-en-1-one.
 15. The composition as defined in Claim 10 wherein the active ingredient is 2-(1-(2-Ethoxyimino)-propyl)-3-hydroxy-5-(2,2-dimethyl-3-oxo-(2H, 4H)-1,4-benzoxazin-6-yl) cyclohex-2-en-1-one.
 16. The composition as defined in Claim 10 wherein the active ingredient is 2-(1-(2-Ethoxyimino)-propyl)-3-hydroxy-5-(2-phenyl-3-oxo-(2H, 4H)-1,4-benzoxazin-6-yl)cyclohex-2-en-1-one.
 17. A method for the kill or control of grassy weeds which comprises contacting said weeds or their habitat with a herbicidally effective amount of a composition which comprises an inert carrier in intimate admixture with a herbicidally active ingredient which is a substituted cyclohexanedione compound corresponding to the formula ##STR50## Wherein D is attached in the 6 or 7 ring position and represents the radical ##STR51## R represents --H, acyl or an alkali metal cation; R¹ represents C₁ -C₃ alkyl, C₃ -C₅ alkenyl, C₃ -C₅ haloalkenyl, arylalkenyl wherein aryl represents phenyl or pyridinyl substituted with from 0 to 4 halo or --CF₃ groups or mixtures thereof and alkenyl contains from C₃ -C₅ carbon atoms;R² represents C₁ -C₃ alkyl; R³ represents --H or --CH₃ ; R⁴ each independently represents --H, halo, C₁ -C₄ alkyl or C₁ -C₄ alkoxy; R⁵ represents --H, C₁ -C₄ alkyl, C₁ -C₄ haloalkyl, C₃ -C₅ alkenyl, C₃ -C₅ haloalkenyl, C₃ -C₅ alkynyl, C₃ -C₅ haloalkynyl, alkoxyalkyl wherein the alkoxy and alkyl group each contains from C₁ -C₄ carbon atoms or alkylthioalkyl wherein each alkyl group thereof contains from C₁ -C₄ carbon atoms; R⁶ represents R⁵, C₁ -C₄ alkoxy or aryl wherein aryl is phenyl or pyridinyl substituted with from 0-3 halogen or methyl groups. R⁷ represents --H or C₁ -C₄ alkyl; and n represents the integer 1, 2 or 3and the herbicidally acceptable organic and inorganic salts thereof.
 18. A method as defined in Claim 17 wherein R is hydrogen.
 19. The method as defined in Claim 18 wherein the active ingredient is 2-(1-(Ethoxyimino)propyl)-3-hydroxy-5-(3-oxo-(2H, 4H)-1,4-benzoxazin-6-yl)cyclohex-2-en-1-one.
 20. The method as defined in Claim 18 wherein the active ingredient is 2-(1-(Ethoxyimino)propyl)-3-hydroxy-5-(N-methyl-3-oxo-(2H)-1,4-benzoxazin-6-yl)cyclohex-2-en-1-one.
 21. The method as defined in Claim 18 wherein the active ingredient is 2-(1-(Ethoxyimino)propyl)-3-hydroxy-5-(3-oxo-(2H, 4H)-1,4-benzoxazin-7-yl)cyclohex-2-en-1-one.
 22. The method as defined in Claim 18 wherein the active ingredient is 2-(1-(2-Ethoxyimino)propyl)-3-hydroxy-5-(2-methyl-3-oxo-(2H, 4H)-1,4-benzoxazin-6-yl)cyclohex-2-en-1-one.
 23. The method as defined in Claim 18 wherein the active ingredient is 2-(1-(2-Ethoxyimino)propyl)-3-hydroxy-5-(2,2-dimethyl-3-oxo-(2H, 4H)-1,4-benzoxazin-6-yl) cyclohex-2-en-1-one.
 24. The method as defined in Claim 18 wherein the active ingredient is 2-(1-(2-Ethoxyimino)propyl)-3-hydroxy-5-(2-phenyl-3-oxo-(2H, 4H)-1,4-benzoxazin-6-yl)cyclohex-2-en-1-one. 